如何在linux 上添加合宙4G 驱动
驱动,内核
Air720正常启动后，通过USB连接到linux设备上，驱动正常加载后会产生如下设备：
1.Air720 系列 （1802/1802S）
2.Air720U系列（8910）
一、修改驱动
首先需要对Linux内核驱动做一定的修改，使操作系统能够支持Air720。
1.Add VID add PID
File: [KERNEL]/drivers/usb/serial/option.c
static const struct usb_device_id option_ids[] = {
//+add by airm2m for Air72x
{ USB_DEVICE(0x1782, 0x4e00) }, /* 720U 系列*/
{ USB_DEVICE(0x1286, 0x4e3d) }, /* 720 系列*/
//-add by airm2m for Air72x
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COLT) },
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA) },
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_LIGHT) },
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_QUAD) },
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_QUAD_LIGHT) }, 2. Add the Zero Packet Mechanism
⦁For linux Kernel Version newer than 2.6.34：
File: [KERNEL]/drivers/usb/serial/usb_wwan.c
static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
int endpoint,
int dir, void *ctx, char *buf, int len,
void (*callback) (struct urb *))
{
struct usb_serial *serial = port->serial;
struct urb *urb;
urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
if (!urb)
return NULL;
usb_fill_bulk_urb(urb, serial->dev,
usb_sndbulkpipe(serial->dev, endpoint) | dir,
buf, len, callback, ctx);//+add by airm2m for Air72x
if(dir == USB_DIR_OUT){
struct usb_device_descriptor *desc = &serial->dev->descriptor;
if((desc->idVendor == cpu_to_le16(0x1286) && desc->idProduct == cpu_to_le16(0x4e3d)) ) /* 720 系列*/
{
urb->transfer_flags |= URB_ZERO_PACKET;
}
if((desc->idVendor == cpu_to_le16(0x1782) && desc->idProduct == cpu_to_le16(0x4e00)) ) /* 720U 系列*/
urb->transfer_flags |= URB_ZERO_PACKET;
}
}
//-add by airm2m for Air72x{
return urb;
}
⦁For linux Kernel Version older than 2.6.35：
File: [KERNEL]/drivers/usb/serial/option.c
static struct urb *option_setup_urb(struct usb_serial *serial, int endpoint,
int dir, void *ctx, char *buf, int len,
void (*callback)(struct urb *))
{
......
/* Fill URB using supplied data. */
usb_fill_bulk_urb(urb, serial->dev,
usb_sndbulkpipe(serial->dev, endpoint) | dir,
buf, len, callback, ctx);
//+add by airm2m for Air72x
if(dir == USB_DIR_OUT)
{struct usb_device_descriptor *desc = &serial->dev->descriptor;
if(desc->idVendor == cpu_to_le16(0x1286) && desc->idProduct == cpu_to_le16(0x4e3d)) /* 720 系列*/
{
urb->transfer_flags |= URB_ZERO_PACKET;
}
if(desc->idVendor == cpu_to_le16(0x1782) && desc->idProduct == cpu_to_le16(0x4e00)) /* 720U 系列*/
{
urb->transfer_flags |= URB_ZERO_PACKET;
}}
//-add by airm2m for Air72x
return urb;
}
3. Add Reset Resume
⦁For linux Kernel Version newer than 3.4：
File: [KERNEL]/drivers/usb/serial/option.c
static struct usb_serial_driver option_1port_device = {
.driver = {
.owner = THIS_MODULE,
.name = "option1",
},
....
#ifdef CONFIG_PM
.suspend = usb_wwan_suspend,
.resume = usb_wwan_resume,
//+add by airm2m for Air720
.reset_resume = usb_wwan_resume,
//-add by airm2m for Air720
#endif
}; ⦁For linux Kernel Version older than 3.5：
File: [kernel]/drivers/usb/serial/usb-serial.c
/* Driver structure we register with the USB core */
static struct usb_driver usb_serial_driver = {
.name ="usbserial",
.probe =usb_serial_probe,
.disconnect =usb_serial_disconnect,
.suspend =usb_serial_suspend,
.resume =usb_serial_resume,//+add by airm2m for Air72x.no_dynamic_id = 1,
.reset_resume = usb_serial_resume,
//-add by airm2m for Air72x
};
4. Modify Kernel Configuration
Step 1：
cd <your kernel directory>
Step 2：
make menuconfig
Step 3：Enable CONFIG_USB_SERIAL_OPTION
[*] Device Drivers →
[*] USB Support →
[*] USB Serial Converter support →
[*] USB driver for GSM and CDMA modems
Step 4：Configure Kernel to Support PPP
[*] Device Drivers →
[*] Network device support →
[*] PPP (point-to-point protocol) support
5.编译内核
make
将编译好的内核下载到开发板。
二、模块测试
将重新编译好的内核下载到开发板之后，待系统重新启动，如果是带RNDIS网卡的驱动，在/dev/目录下会出现如下设备节点：
Air720的AT端口是/dev/ttyUSB2，现在你可以使用UART端口工具如“minicom”或“busybox microcom”测试AT功能，结果如下：
- 发表于 2019-08-06 14:18
- 阅读 ( 5466 )
